/**
 * Software License, Version 1.0
 * 
 * Copyright 2003 The Trustees of Indiana University.  All rights reserved.
 * 
 *
 *Redistribution and use in source and binary forms, with or without 
 *modification, are permitted provided that the following conditions are met:
 *
 *1) All redistributions of source code must retain the above copyright notice,
 * the list of authors in the original source code, this list of conditions and
 * the disclaimer listed in this license;
 *2) All redistributions in binary form must reproduce the above copyright 
 * notice, this list of conditions and the disclaimer listed in this license in
 * the documentation and/or other materials provided with the distribution;
 *3) Any documentation included with all redistributions must include the 
 * following acknowledgement:
 *
 *"This product includes software developed by the Community Grids Lab. For 
 * further information contact the Community Grids Lab at 
 * http://communitygrids.iu.edu/."
 *
 * Alternatively, this acknowledgement may appear in the software itself, and 
 * wherever such third-party acknowledgments normally appear.
 * 
 *4) The name Indiana University or Community Grids Lab or NaradaBrokering, 
 * shall not be used to endorse or promote products derived from this software 
 * without prior written permission from Indiana University.  For written 
 * permission, please contact the Advanced Research and Technology Institute 
 * ("ARTI") at 351 West 10th Street, Indianapolis, Indiana 46202.
 *5) Products derived from this software may not be called NaradaBrokering, 
 * nor may Indiana University or Community Grids Lab or NaradaBrokering appear
 * in their name, without prior written permission of ARTI.
 * 
 *
 * Indiana University provides no reassurances that the source code provided 
 * does not infringe the patent or any other intellectual property rights of 
 * any other entity.  Indiana University disclaims any liability to any 
 * recipient for claims brought by any other entity based on infringement of 
 * intellectual property rights or otherwise.  
 *
 *LICENSEE UNDERSTANDS THAT SOFTWARE IS PROVIDED "AS IS" FOR WHICH NO 
 *WARRANTIES AS TO CAPABILITIES OR ACCURACY ARE MADE. INDIANA UNIVERSITY GIVES
 *NO WARRANTIES AND MAKES NO REPRESENTATION THAT SOFTWARE IS FREE OF 
 *INFRINGEMENT OF THIRD PARTY PATENT, COPYRIGHT, OR OTHER PROPRIETARY RIGHTS. 
 *INDIANA UNIVERSITY MAKES NO WARRANTIES THAT SOFTWARE IS FREE FROM "BUGS", 
 *"VIRUSES", "TROJAN HORSES", "TRAP DOORS", "WORMS", OR OTHER HARMFUL CODE.  
 *LICENSEE ASSUMES THE ENTIRE RISK AS TO THE PERFORMANCE OF SOFTWARE AND/OR 
 *ASSOCIATED MATERIALS, AND TO THE PERFORMANCE AND VALIDITY OF INFORMATION 
 *GENERATED USING SOFTWARE.
 */
package cgl.narada.wsinfra.wsrm.impl;

import java.io.File;
import java.util.Hashtable;

import cgl.narada.wsinfra.exception.DeploymentException;
import cgl.narada.wsinfra.wsrm.storage.WsrmStorageException;

/** 
    This is a factory class which ensures that there is only instance of the
    WsrmSourceNode for a given configuration file. This class is primarily
    useful for deployment purposes.

    @author Shrideep Pallickara
    $Date: 2005/07/29 22:41:30 $
    $Revision: 1.2 $
*/


public class WsrmNodeFactoryImpl  {
  private static final WsrmNodeFactoryImpl instance = 
  new WsrmNodeFactoryImpl();
  
  private Hashtable sourceNodes;
  
  private String moduleName = "WsrmNodeFactory: ";
  
  private WsrmNodeFactoryImpl() {
   sourceNodes = new Hashtable();
  }
  
  public static WsrmNodeFactoryImpl getInstance() {
    return instance;
  }
  
  /** Gets a sequence monitor for the specified configuration file. For a 
      given configuration file (based on the absolute path name) only one
      instance of the WsrmNode will be running within a given
      JVM instance. */
  public WsrmSourceNode getWsrmSourceNode(String configInfo)
    throws WsrmStorageException, DeploymentException {
    String errorReport = null;
    File configFile = new File(configInfo);
    
    if (configInfo == null) {
      errorReport = moduleName + "Specified configFile is NULL!";
      throw new DeploymentException(errorReport);
    }
    
    if (!configFile.exists()) {
      errorReport = moduleName + "No file corresponding to Config location [" 
	+ configInfo + "] exists. Check the supplied info.";
      throw new DeploymentException(errorReport);
    }
    
    String absolutePath = null;
    
    try {
      absolutePath = configFile.getAbsolutePath();
    } catch (SecurityException secEx) {
      System.out.println(moduleName + "Problems creating AbsolutePath for [" +
			 configInfo + "], will do without it. ");
      absolutePath = configInfo;
    }
    
    
    WsrmSourceNode wsrmSourceNode;
    /** If a monitor does not exist, proceed to create one and add it to
	the monitors list. */
    if (!sourceNodes.containsKey(absolutePath)) {
      wsrmSourceNode = new WsrmSourceNode(absolutePath);
      sourceNodes.put(absolutePath, wsrmSourceNode); 
    }
    
    wsrmSourceNode = (WsrmSourceNode) sourceNodes.get(absolutePath);
    return wsrmSourceNode;
  }

}
